#include <REGX52.H>
void Delay(unsigned int xms)
{
	unsigned char i, j;
	while (xms)
	{
		i = 2;
		j = 239;
		do
		{
			while (--j);
		} while (--i);
		xms--;
	}
}
unsigned char LEDnum=0;
void main ()
{
	if(P3_1==0)
	{
	Delay(20);
	while (P3_1==0);
	Delay(20);
	LEDnum++;
	if(LEDnum>=8)
		LEDnum=0;
	P2=~(0X01<<LEDnum);
	}
	
	
}